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NGord's avatar
NGord
Icon for Occasional Contributor rankOccasional Contributor
2 years ago
Solved

Quartus MSGDMA core Empty bits when used from Avalon ST to Memory Mapped transfer

On an Avalon-ST to Memory mapped DMA transfer, if Empty bits are set, on the Avalon ST bus, what happens to a 32 bit Memory mapped transfer, does the DMA just write the relevant bytes to memory?
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  • ShengN_altera's avatar
    ShengN_altera
    2 years ago

    Hi,

    If using the Packet Support Enable feature, Empty bits signal will be available. With this feature enabled, actual bytes (no additional bytes) will be transferred for the transaction. So I would say that DMA will just write the relevant bytes to memory as mentioned before.

    Thanks,

    Sheng

ShengN_altera's avatar
ShengN_altera
Icon for Super Contributor rankSuper Contributor
2 years ago

Hi,

If using the Packet Support Enable feature, Empty bits signal will be available. With this feature enabled, actual bytes (no additional bytes) will be transferred for the transaction. So I would say that DMA will just write the relevant bytes to memory as mentioned before.

Thanks,

Sheng